/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    https://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package grails.web;

import org.springframework.util.StringUtils;

/**
 * URL converter that allows for hyphenated URLs
 *
 * @author Jeff Brown
 * @since 2.0
 */
public class HyphenatedUrlConverter implements UrlConverter {

    public String toUrlElement(String propertyOrClassName) {
        if (!StringUtils.hasText(propertyOrClassName)) {
            return propertyOrClassName;
        }

        StringBuilder builder = new StringBuilder();
        char[] charArray = propertyOrClassName.toCharArray();
        char lastChar = ' ';
        for (char c : charArray) {
            if (Character.isUpperCase(c)) {
                if (builder.length() > 0 && lastChar != '.') {
                    builder.append('-');
                }
                builder.append(Character.toLowerCase(c));
            } else {
                builder.append(c);
            }
            lastChar = c;
        }
        return builder.toString();
    }
}
